ПСК CONTAINER 73 mm, 89 mm

Example of submersible pumping equipment scaling

Example of asphaltene-resin-paraffin deposition on submersible pumping equipment

Solid inhibitors are fed into a well using a submersible downhole container (ПСК) installed under the pump. A ПСК con-tainer is a module consisting of solid-bed sections. A section is a hollow cylindrical shell (tubing nipple) which is hydrau-lically bound to the well.

1. A non-reusable ПСК container, and third-party counterparts thereof.

This container comprises several sections of 73-mm or 89-mm diameter with a solid inhibitor inside the metallic section (powder, pellets, paste, capsules):

• A high amount of reagent can be enclosed in the section but the inhibitor cannot be replaced directly at the wellsite, nor can the container be disassembled in order to perform the acceptance and quality check of the in-hibitor at the storage.
• Total replacement in case of emergency pulling.
• The design precludes long-time storage in humid climate because the solid inhibitor is hygroscopic, and can react with the wall of the metallic section forming solid, insoluble deposits (iron salts) which reduce the inhibitor con-tainer performance.

2. A capsular reusable ПСК container by Novotex LLC has specific advantages over third-party counterparts.

This container comprises several sections of 73-mm or 89-mm diameter enclosing chemically neutral, solid-inhibitor-filled capsules

Operating temperature of the capsules: up to 170°С.

This container has the following advantages over the non-reusable one:

• The inhibitor carryout can be customized to a particular well.
• The capsules can be replaced just before running the container (in case of emergency pulling).
• Several types of inhibitors can be simultaneously used inside the same ПСК container.

The capsules are entirely (the walls and the cap) made of a chemically neutral material with high melting temperature of up to 170°C.

During storage and transportation, the capsules enclosing a solid reagent prevent the chemical from contacting the in-ner metallic wall of the container section which has a beneficial effect on the container performance and on the inhibitor feeding, and prevents formation of iron salt crystals.

This is because the chemical basis of the solid antiscalant is a hydroscopic, powdery organic acid which, as the ambient humidity increases, can react with the container section wall metal thus forming solid, insoluble deposits (iron salts) which block the container section channels and considerably reduce the container performance. A reusable container with solid inhibitor enclosed inside chemically neutral capsules is free of the above disadvantages.

• 100% active inhibitor basis
• The solid inhibitor is continuously dispensed into produced fluids due to gradual dissolution of the active basis
• Scaling is prevented
• Submersible oilfield equipment is protected against asphaltene-resin-paraffin deposition along the entire path-way of inhibitor-saturated water- oil flow
• The time between overhaul (TBO) and the cleaning interval (CI) of a producing well are increased
• Once installed in a well, a ПСК container needs no maintenance
• After a well is started up, the inhibitor-ubti0fkuid dispensation begins instantaneously
• Submersible pumping equipment is protected at the initial stage of post-overhaul operation

A submersible downhole container is attached to the ESM base or to the telemetering system using an adapter, and run in. The ПСК design ensures that the reagent can be fed directly to the ESP inlet.

• Container length: 8 m to 30 m
• The bottom container section is located 10 m to 30 m above the perforated interval